Printing or plate cylinder for rotary printing-presses.



W. K. HODGMAN. PRINTING QR PLATE CYLINDER FOR ROTARY PRINTING PRBSSES.

APPLIGATION FILED APE.18, 1907.

Patented Oct. 13, 1908.

- fizz/6111611" ll/illisltfidgm aiz UNITED STATES PATENT OFFICE;

WILLIS K. HODGMAN, OF TAUNTON, MASSACHUSETTS, ASSIGNOR TO HUBER-HODGMAN PRINTING PRESS COMPANY, OF TAUNTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

Specification of Letters Patent.

Patented Oct. 18, 1908.

Application as April 1a, 1901. Serial miseaam.

To all whom it may concern:

Be it known that I, WILLIS K. HoDGMAN, a citizen of the United States,'residing at Taunton, in the county of Bristol and State of Massachusetts, have invented an Improvement in Printing or Plate Cylinders for, R0- tary Printing-Presses, of which the following description, in connection with the accompanying drawings, is a specification, like let ters on the drawings representing like parts.

This invention relates to printing or plate cylinders, and particularly to provisions for securing stereotype, electrotype or other printing plates thereto. p

In order that the principles of my invention may be readily understood, '1 have disthe cylinder.

Stereotype, electrotype and otherprinting plates have been secured to printing or plate cylinders in different ways, but mainly b roviding a large number of holes in the cy inder to receive screws or bolts having means to engage the edges of the lates, or by providing parallel grooves in t e surface of the engaged thereby.

c linder, usually parallel or at right angles to the axis thereof, such grooves usually being undercut to receive therein nuts and Screws adapted to engage directly or otherwise the edges of the late- The provision of such oves permits the positioning of the securmg screws or means at certain points, but is far less effective than if such grooves were diagonall disposed upon the surface of the cylinder, or-such diagonally disposed grooves would permit the positioning 0 the securing screws or means at any desired points dependent upon the size and position of the plate Great expense is involved,

. however, in forming'diagonal grooves in the surface of a cylinder, so that such method of proced'hre is substantially prohibited. By my invention, it is made possible to provide the superior and far more effective diagonal grooves without increased expense and in reality at less expense than if grooves were formed in the surface of the cylinder parallel that are to have grooves out therein, of unusually strong material, such as steel castings,

to provide a proper strength of parts after I the weakening necessarily occasioned by the grooves, and it has been necessary that such castings be perfect, as any defect in the surface grooved, condemned the whole cylinder.

By my invention I am enabled to make printing or plate cylinders of cast iron if desired, and it is immaterial, as regards the securing of the plates to the cylinder, whether or not the surface of the cylinder be free from defects incident to casting. By em ploying securing means, as will be more fully described, of better material than cast iron, or even than steel casting if desired, I am on abled to produce a better article at less cost than any of which I am aware.

Referring more specifically to the drawings and toy the single type or embodiment of the invention therein represented, a printing or plate cylinder of any usual construction and prefera ly of cast iron, which in the practice of my invention, I am enabled to employ, is represented at 1. Heretofore it has been common to groove the surface thereof, to reccive securing means for the printing or other plates.

In accordance with my invention, I rovide metallic strips 2 of any suitable width and length, and preferably formed as upon the under surface thereof, to receive securing means for the printing plates. .lv'hile I may employ any suitable material, and form or shape the strips in any suitable wa into the desired shape, as by casting or ot erwise, I

refer to use a material ,which may readily be bent into the desiredshape. that such strips may be straight in form so as to be secured to the ylinder parallel to the axis thereof, and preferably from end to end of the cylinder, or that they maybe bent to encircle more or less of the circumference of It is apparent the cylinder in a plane normal to the axis of the cylinder, or at any desired angle thereto, that is, the may be spirally or helically disosed, the atter form being preferable and erein indicated. Herein I have re resented the strips 2 as so bent as to-be apphed to the cylinder and to be secured thereon, at an angle of about 45 to the axis of the c linder. Dependent upon the type of cylin er employed, the whole or on y a portion of the cylinder surface may have strips applied thereto. In the form of cylinder shown in Figs. 2 and 3, a portion of the cylinder is left free of such strips, and herein and if desired, the strips ma be of varying length certain of them extending from end to end of the cylinder and encompassing a large proportlon of the circumference thereof, others being of gradually decreasing length. It is a parent that the length of the strips, the orm or curvature thereof, as well as the material em loyed, may be varied as desired. l i hlle I may em loy any suitable material, preferabl and if t e strips are to encompass more or ess of the surface of the cylinder,

. either normal to the axis thereof or at an inclination' thereto, referably I employ a material adapted to he readil bent into form, as for exam le, the so cal ed yellow metal, composed of copper, tin etc., which is of a ve ductile nature, un erstood that any be employed. 1

If the strips are to be disposed as indicated in Fig. 1, the are bent into proper form by or soft steel, it being suitable material may any suitable evice or mechanism forming no part of this invention, the strips being preferably peened or hammered during the bendmg process, as I find that in certain cases this step aids in securinghthem in shape. While the strips may be s aped or constructed in any suitable manner, toreceive and hold the plate securing means, such as bolts or screws, preferably I dovetail the strips upon opposite sides thereof as indicated at 3 in Fig. 3, though they may be beveled, undercut or otherwise fashioned to receive and hold securing means. Preferably the strips are suitably shaped to this end, before bending. In the present type of the invention, the strips, so bent, are attached in any suitable way to the surface of the cylinder as by screws 4 engaging screw threaded holes 5 in the cylinder, said strips being secured to the cylinder at their end portions and also intermediate sueh portions. Any suitable means may however be employed to fasten the strips to the c linder. If the strip is to be bent, preferah y the holes for the screws 4 are not formed therein until after the strip has been bent, as such bending tends to somewhat deform the. holes. The stripsare attached to the cylinder at any desired distance apart, thus providing between them holding grooves which are preferably of a larger dithe ameter at or near the bottom than at the top,

to receive any suitable plate securing means,

Having thus described one type or embodiment of my invention, I desire it to be understood that although I have employed :(aipecific terms they are used in a generic or escriptive sense and not for purposes of limitation, the see e of the invention being set forth in the fo owing claims.

Claims.

1. A printing orplate cylinder for rotary printing presses having a series of paralle arcuate, metallic strips secured thereto at their end portions and intermediate such portions, said strips being disposed nonarallel to the axis of the cylinder and conormi in curvature to that portion of the cylindrical surface to which the are. applied and spaced apart to provide holding grooves adapted to receive therein securing means for printing or other lates to be fastened to the surface of the said strips.

printing presses hav ng a series of paralle metallic strips fixedly secured to the surface of said cylinder at their end portions and also intermediate such portions, said stri s conforming in shape to that portion of t e cylinder to which they are applied and spaced apart to provide holding grooves adapted to receive therein securing means for printing or other plates to be fastened to the surface of said strips. 3. A printing or plate cylinder for rota printing presses having a series of paralle metallic, stri s fixedly ositioned upon said cylinder, said strips con forming in curvature to and contacting throughout their length with that portion of the curved surface of the cylinder to which the are applied, said stri s being secured to sue surface at their enss and at intermediate points in their length, and spaced apart to provide holding grooves, the edges of said strips being shaped to re- 2. A printing or plate cylinder for. rotary i ceive .and retain from outward movement at one or more intermediate points with the secured thereto, said curved surface of the cylinder and rovided with means to secure it to the cyhn er at its ends and at such intermediate point or points, and of reduced dimension in cross sectionat 'or toward its lower face whereby said grooves are enlarged toward their bases and are adapted to receive for longitudinal movement therein but to retain from outward movement securing means for printing,

or other plates to be fastened to the surface of the said strips.

5. A printing orplate cylinder for rotary presses having elongated, metallic, elically shapedstrips secured thereto and spaced a artto provide grooves disposed non-par grooves being adapted to receive therein securing means for printing or other plates to be secured to the surface of the strips.

6. A printing or plate cylinder for rotating printing resses having elongated, ductile, metallic, elically sha ed strips secured to the surface thereof an spaced apart to prowide ooves disposed non-parallel to the axis-o the cylinder, said grooves being adapted to receive therein securing means printing or other plates .to be secured to'the surface. of the strips. f

senses el to the axis of the cylinder, said it rinting or plate cylinder for rotary 21m presses having elon ated, helically 3o posed, metallic stri of d' erent material from that of the cylin er secured thereto and spaced 0. art to provide .ooves disposed non-para e1 to the axis of e cylinder, said grooves being adapted to receive thereinsea5 curing means forprinting or other plates to be secured to the surface of the strips,

8. A printing or plate cylinder or rotary printing presses having aseries of helical] osed, metallic strips secured to said cy 40 in er, said strips being of reduced diameter in cross section at or toward the surface of the strip, that is applied to the cylinder, said strips bein positioned slightly apart to provide a ho d ng groove adapted to receive therein for longitudinal movement but to re tain from outward movement securing means for printing or other lates to be fastened to the surface ofgthe said strips.

In testimony whereof, I have signed my name to this specificatiom in the presence of two subscribing witnesses.

WILLIS K. HODGMAN. Witnesses:

BICKNELL HALL, 'Frmnnarox M.'A'rwoor 

